Padlock.



PATENTED NOV. 21, 1905. H. P. TOWNSEND & O. E. JOHNSON. I

PADLOOK.

APPLIOATION FILED muxas. 1905.

UNITED STATES PATENT OFFICE.

HARRY P. TOWNSEND AND CHARLES E. JOHNSON, OF NEW BRITAIN, CONNECTICUT,ASSIGNORS TO CORBIN CABINET LOCK COMPANY, OF NEW BRITAIN, CONNECTICUT, ACORPORATION OF CONNECTICUT.

PADLOCK.

Specification of Letters Patent.

Patented NOV. 21, 1905.

Application filed March Z5, 1905. Serial No. 251,933.

To (1r/ZZ whom, it puny concern:

Be it known that we, HARRY P. TowNsnND and CHARLES E. JOHNSON, citizensof the United States, residing at New Britain, county of Hartford, Stateof Connecticut, have invented certain new and useful Improvements inPadlocks, of which the following is a full, clear, and exactdescription.

Our invention relates to improvements in padlocks.

The object of our invention is to simplify the construction thereof andso arrange the parts that the picking of the lock is rendered mostdifficult. These and other advantages will be apparent to the mechanicskilled in the art from a reading of the following description.

In the drawings, Figure I is a side elevation of one form of the lock,one side of the case being removed to reveal the internal construction,the hasp being closed. Fig. 2 is a similar view, the hasp and otherparts being in a different position. Fig. 3 is a similar view of anotherform of the padlock, the hasp being closed. Fig. 4 is a similar view,the hasp and other parts being in a diiferent position.

Referring rst to the construction shown in Figs. l and 2, A is thelock-case. B is the hasp or shackle. C is the locking-dog, pivoted at D.E is the hooked end of the dog, which is arranged to engage with a notchin the end of the hasp B. F is the heel of the dog, which extends belowthe pivotal center D. Gr is the tail of the dog arranged to coact withthe tumblers H. The number of tumblers employed is of course immaterial.Iis a notch in the end of each tumbler H, arranged to receive the tailGr of the dog when said tumblers stand in a certain position. J isaspring for actuating the tumblers to cause them to normally assume theposition shown in Fig. l. K is a spring member carried by the dog C, thesame being so arranged that it will tend to throw the hasp open when thehooked end E of the dog is freed therefrom. This may be accomplished,for example, by beveling or inclining the end of the spring member K.

The lock shown in Figs. l and 2 is operated by means of a double-bittedkey, one bit of which operates the tumblers first while the opposite bitengages the heel F of the dog, so

as to swing it upon its pivot D and free the shackle B.

Now referring to the construction shown in Figs. 3 and 4, A is thecasing. B is the hasp. C is the dog, pivoted at D. E is the hooked endof the dog arranged to engage in a notch in the end ofthe hasp orshackle B. F is the heel of the dog, which in this instance is hookedfor the purpose hereinafter described. G is the tail of the dog C. H isthe tumbler. I is afnotch therein. yJ is a spring for normally causingthe tumbler H t0 assume the position shown in Fig. 3. K is the springmember carried by the dog C, the same being in the form of a plungermounted in a suitable guide on the said dog and pressed outwardly underthe influence of the spring K2. In operation it will be observed thatthe action is generally similar to that of the spring member K of Fig.l.

Instead of operating the lock of Figs. 3 and I by means of adouble-bitted key we are permitted to use a single-bitted key, onebitting of which is arranged to operate the tumblers, while the adjacentbitting engages with the hooked heel F and throws the dog from theposition shown in Fig. 3 to the position shown in Fig. 4 after thetumbler or tumblers have been properly lined up. We preferably provide astop L for the free end of the shackle B. When present 4this stopprevents the dog from being thrown out of the tumblers when the haspstands open, because, as shown inv Fig. 4, the side of the member. Kwill engage `said stop L before the tail G of said dog could bewithdrawn from said tumbler.

In both forms of the lock shown it will be observed that the pivot forthe dog is placed under the hooked end of the shackle so that if a pullis exerted on said shackle it will not tend to swing the dog and causethe tail to bear heavily against the tumblers, thus making it mostdifficult to pick the lock in the well-known way by feeling through thetumblers.

The spring member carried by the dog in each instance tends to normallyhold the dog into locking engagement with the shackle, and, further thanthis, it also performs the function of tilting the dog, so as to freethe same from the tumblers and cause it to engage the hasp whenv thelatter is closed.

IOO

1. In a padlock, a hasp, a dog therefor, a spring carried by said dog,said hasp coperating with said spring to throw said dog, and a tumblercoacting with said dog.

2. In a padlock, a hasp, a dog therefor, a spring carried by said dog,said hasp coperating with said spring to throw said dog thereby, and atumbler coacting With said dog, Said tumbler and dog being arranged tobe engaged and operated directly and simultaneously by a suitable key.

3. In a padlock, a hasp, a pivotally-rnounted dog, a Spring devicecarried by said dog and arranged to cooperate with said hasp to throwsaid dog When said hasp is closed, and means to operate said dog to freeit from said hasp.

4:. In a padlock, a hasp, a dog therefor, a spring carried by said dog,said hasp coperating with Said Spring to throw said dog, and a tumblercoacting with said dog, and means to prevent the dog from becoming freedfrom the tumblers While the hasp is open.

5. In a padlock, a hasp, a tumbler, a pivoted dog, a hooked end arrangedto engage the hasp, a tail arranged to engage the tumbler, and aprojecting heel or extension arranged to be engaged by a keysimultaneously with the tumbler, and means operable by the hasp to throwsaid dog as the hasp is closed.

6. In a padlock,la hasp, a tumbler, a pivoted dog, a hooked end arrangedto engage the hasp, a tail arranged to engage the tumbler, and aprojecting heel or extension arranged to be engaged by a keysimultaneously with the tumbler, and a spring device carried by saiddog, arranged to move the hook of the dog into engagement with the haspwhen the latter is closed, said hasp cooperating with said spring deviceto effect said closing movement of said dog.

HARRY P. TOWNSEND. CHARLES E. JOHNSON. Witnesses:

CHAS. J. Cox, JOS. H. LATHAM.

